Fluid actuated tool



1943. R. o. ALLEN 2,326,735

FLUID ACTUA'IED TOOL Filed Nov. 8, 1941 QINVENTOR Roy 0 HHen/ Qt/M;

H I S ATTORNEY.

Patented Aug. 17, 1943 142 326,135v I v FLUD) ACTUATED roon' i r I I RoyiO; Allen, Athens, Pa., a'ssig'nor to I1'1 gersoll-- Rand'Gompanm-New York; N; Y., a corporationof New Jersey 'Application November s, 1941; Serial Na i-1331a v3 Claims; (01. 12 1-45) invention relates to fluid actuatedtools, and more particuiany' to a fluid actuated -rivetmg machine or the percussive type having a m'ourfting to slidably support the riveting macnin'e with respect to the work.

ne object or the invention is to. enable the riveting machine to be conveniently shifted to difierent workin positions with respect to its inountiiigin accordance with the variations in theuiinen'sions of the work upon which the machine operates. a

Another object is to enable the riveting "ma 1 chine to be moved to andheld against the work under a comparatively light pressure so that the workmay 'be conveniently adjusted to a correct position with respect to the riveting machine before a heavy holding pressure is applied to the riveting machine for retaining it firmly against thework during the upsetting o'f'a' rivet. 1 Qther'ob'jects will be in part obviousand in partfpointed out hereinafter. l

In the drawing accompanying this specificatidn and in which similar reference numeralsfrererto similar parts, V Figure 1 is a longitudinal elevation, partly in section, oi'a ma actuated tool constructed in accordance with the practice of the invention and an example of work upon which the tool may operate, V l m Figure '2 isa transverse view taken through Figure 1ontheline2-2, and V Figure 3'is a view similar to Figure 1 showing the perouss'iveelement of the tool in a working position. I 1 I '1 V I .i geierring more particularly to the drawing, 2%] designates afluid actuatedfpower unit shown as being in the form -of a riveting machine and 2 [an e ample of work upon which the riveting ma-' chine may operate. [The riveting machine is arranged slidably in a casing 22 supported by v a bracket 23 which also supports the work 21.

a piston chamber '3'i forthe accommodation or a hammer piston "32 -recipro'ca151e in the piston chamb'erior actuatinga rivet set 33 at'the'irdnt endoithecylinder; I I A suitable valve mechaifismflisarranged in the cylinder and the head block tor distributing pressure fluid to the pistoncha-mber; such sure fluid being conve'irdtothe valvemechamsm by 'a'passage, or passages; 35 in tirehe'ad "31!Qandfcommunicating' vt'riththe rearward em in the riveting machine-issli'dably arranged 7. piston cliaiifberhasa ireeexhaust'portisi inter mediate its ends tocommunicate the piston charm her with'tl'ie-boreforwardly 0 f .p'ort3 1;

The peripheral as a nice sliding ht'cn the-suffa-ceof the bore cate the space -of the bore' 'iorwa-rdly of tireexf erably near the rearwardend thereo'f'is -a= seai1-= ing ring' ll! to prevent the le'akage of-nuid along the cooperating surfaces of the head hlock and I the bore '36. The riveting inahirre is additionally guidedin the casing?! by a bushing -1 threaded into the front end of the "casing and fhaust deflector with the atinospherd: wan "of the bushiiig is, moreover, groove; p'r fde a seating surface '43 for an 1nd l of a "spring which encircles *hepylinder andseatswith its other 'end' against iairinclinedjshoulder'lliioi the V exhaust de'flectjorailp 1 The casing 22 is adjustable with respectgtojtl'ie bracket 23 and the bracket is accordinglyprovided with a clainpelement 2lof a welliknow'n "form adapted to enable the casing 22, together with the riveting machine, to be shiftedtto'or from the work. The bracket '23 has an arm '25.

that lies in the path of the riveting machine and contains an anvil block zdhavin'g a suitablei'ecess'fl to accommodate the head of a rivet 28 extending through the work 2|.

Briefly described, the riveting machine 29, which may be of a known type, comprises, as casing parts, a cylinder 29 and a head block 30 threadedly connected thereto. The cylinder has "The riveting machine, when idle; is heldin 'its rearm'ost limiting position inthe bere t-(Shy the spring l l but is-actuatedto the different working positions which it may 'ocoupy by pres- I sure fluid. To 'this end thecasing'isrprovided-' with a bore t'kfiof considerably -smaller diarir eter than the bore 3B','in'to"which itopens with its front end, and'inthehorefi is a Tree plunger '41 having a pressure-surfacefili on its rearward end to .wh'ich pressure' fluid is applied for "mov- "ing the rivetingmaichine fjorwardly in the cas- 'ing 22. "On the Oppositeefid"of' 'fihdplimger'wl is a reduced steinz49 that seats against'the rear 7 ward end of the head block 30 constituting,'in the construction shown, a pressuresurface 50.

The pressure fluid applied to the pressure sur- I 'head blobk and an exhaust deflector 38'- encircling the "frontendof thejheadblock BIand theadiaoent portion of "the cylii'ider f'29 overlies the'exiraust airmen*or-tiieiieaamaeret I faces 48 and 50 is controlled by a valve of the rotary type arranged in a valve chamber 52 that bisects a passage 53 leading from a supply conduit 54, at the rearward end of the casing 22,

, to the bore 36. A passage 55 also leads from the the rearward .end of the valve chamber 52 to bore 46. v

The throttle valve, which is provided with a lever 55 for its'manip ulation, has'a partly'ann'ul'ar peripheralgroove 51 of such length as to afford communication between the several branches of the bores 46, and 36 and the pressure fluid in the passage 53 in what may be termed the openposition, of the valve 5!. A branch passage 58 leads from an intermediate portion of the groove 51 longitudinally along the valve. 5| to apartly annular passage 59 also in the periphery of the valve. The passage 59 lies in the same longitudinal plane as the point of communication of the 7 passage 55 with the valve chamber 52 wherewith it is intended to register.

The passage 5%! is so arranged that its leading end lies in a different radial 'plane'than the corresponding end of the'groove5] in order that pressure fluid may be introduced into the passage 55 before the valve reachesa position inwhich the groove communicates the branches of the passage 53 witheach other. i I.

The valve 5 l also controls thev exhaust offluid frornthe bore 476 and to this ehdtheyalve is provided in its periphery'with an annular passage 60 to afford communication between the passage 55 and the branch of the passage 53 lying between the valve chamberl52 and the bore 36.. In the operation of the deviceQthe valve 5]"is rotated to bring theleading endofQthepassage 59linto registrywiththe passage 55. Pressure fiuidwillthe n flow into the were against the pressure surface 48 and .move the riveting machine 2B forwardly in the casing 22 until the rivet set 33 seats against the rivet 28. The machine 23' will move readily in the direction without creatinga sub-atmosphericpressurein the chamber 36 since the said chamberiwill be in communi cation with the atmospherethrough the exhaust port 31, the piston chamber 3| and the passages in the riveting machine that control theiactions of the valve 34 and the piston 32. .Afterthe work has been correctly positioned 'with' resp'ect .to the riveting mechanism the valve 51 is rotated further in the same direction until the groove passage 53 with each 3 other. Pressure iiuid then flows into the rearwardehd of tliebozfe against a tributing valve mechanism wherebyit will be distributed to the ends of the piston chambertl for actuating the piston 32. Such pressure fluid forward portion of the bore 38 thence through the ports 42' to the atmosphere} Y The riveting machine and the plunger. 4! will remain in the positions described and th'e'percussive and the pressure fluididistributing ele- 5! communicates the several branche's of the" exhausts from the piston chamber 3! through f Ithe'port 37 and the exhaust clefiector'into the 5 fiuid for holding ment of the riveting machine'will continue op} the bore lfilwillexhaust through the passages 55, 60 and 53'into the bore 35, whence'itrhay pass through the valve mechanism 34 and the piston chamber 3| to the atmosphere together with the pressure fluid existing in the chamber 36 after the valve 5| has been moved to its closed position. T Thespring 44 will then return the riveting machine and. I the plu'nger M rearwardly to their starting positions.-

I claim;

l. A fluid actuated tool, comprising a stationary casing, a fluid actuated percussive power unit slidable in the casing, means to yieldingly resist forward movement of .the power unit in the casing and to movethe power unit rearwardly in the casing, a free'plungerin the casingse'ating against the power unit and having a pressure surface, a pressuresurface on the powerhnit'of different area than the first mentioned pressure surface, pressure chambers for the a'ccommoda tion of the pressure surfaces and one of said pres sure chambers serving as'a supply 'ch-arnberior the power unit, and means for subjecting the pressure surface of smaller area to pressure fluid to move the power unit forwardly through the casing to a working position and" to subsequently subject the otherpressure surface to pressure the power unit in such orking position, v z. A fluid actuatedtool, comprising a stationary casing; a fluid actuated percussive powerunit slidable in'ther casinga free plunger in the c asing to seat against the rearward endf'ot the' power unit andhaving a pressure surface a pressure surface-on the power unit, pressure chambers for the accommodattion or" the pressure surfaces and one of said pressure chambers s'erving as'asupply chamber for the power unit, and means for first subjecting the pressure surface on the plunger to pressure fluid for moving'the power unit for- War-dlyin the'casing to a working-position and subsequently subjecting the pressure surface on the power unit to pressure fiuid'for holding the power 'unit in such working position. I p 3. -A 'fluid actuated tool, comprisingastationarycasing, a fluid actuated percussive power .unit

slidable in the casing, a pressure surface on the power unit, a free plunger in the casing seating against the power 'unit and having a'pressu'r'e said pressure chambers-serving as a supply chamber forthe power unit, and a 'valve movable'to 'oneposition to first valve pressure fluidto'the 'pressure surface on the "plunger to" move the power unit forwardlyin thecasing to a working I position and being movable to another position to valve pressure fluid' to the pressure surface on the power unit jtohol'd the vpowerunit in such working position. I v ROY. o, LLE1 

